Oil well jar-sealed type



June 23, 1959 A. v. sEGELHoRsT OIL WELL JAR-SEALED TYPE Filed Nov. 30, 1953 M/@AL United States Patent O OIL WELL JAR--SEALED TYPE August V. Segelhorst, Corona Del Mar, Calif., assigner to S. R. Bowen Co., Santa Fe Springs, Calif., a corporation of California Application November 30, 1953, Serial No. 395,147

4 Claims. (Cl. Z55- 27) 'Ihis invention relates to an oil well jarring tool by means of which certain objects, such as a bit, a string of pipe or the like, can be loosened and removed from a well if the object should become stuck in the bore of the well. This invention is an improvement on Patent No. 2,059,540, issued November 3, 1936, for Oil Well Jar.

An object of my invention is to provide a novel jarring tool in which the body of the tool is sealed or packed off at both the top and the bottom, so that the wearing parts therein are thus protected against intrusion of abrasive material which might be found in a well.

Another object of my invention is to provide a jarring tool which is moved longitudinally to impart a blow to the object which is stuck in the hole, the jarring tool being provided with a floating seal or pack-off which will follow the longitudinal movement of the jar.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure l is a longitudinal sectional view of my tool showing the tool in lowered position.

Figure 2 is a fragmentary longitudinal sectional View of the upper portion of the tool showing the parts in raised position.

Figure 3 is a sectional View taken on line 3 3 of Figure 1.

Figure 4 is a fragmentary longitudinal sectional view of the lower portion of the tool.

Referring more particularly to the drawing, the numeral 1 indicates the bottom sub, the lower end of which is threaded as at 2, so that this sub portion of the tool may be connected or threaded onto the bit, the tool joint, the pipe, or any similar structure which may be stuck in the bore of the well. The sub 1 threads into a tubular bowl or housing 3. An anvil coupling 4 screws into the top of the bowl 3, substantially as shown. A top sub 5 is xedly mounted to the upper end of the mandrel 6, preferably by being threaded onto the threads 6 of the mandrel. The top sub S is also threaded as shown at 5' to receive the drill pipe 7 and by means of which the tool is supported in the well. T he mandrel 6 is hollow so that iluid can pass longitudinally therethrough, and a wash pipe 8 screws into the lower end of the mandrel 6 and projects downwardly into the bottom sub 1, and the purpose of this wash pipe will be further described.

At the upper end of the bowl 3 I provide a plurality of longitudinally extending splines 9 and the mandrel 6 is provided with complementary splines and grooves 10 which fit the splines 9, thus providing a guide on which the mandrel 6 can move longitudinally, as will be further described. The bottom sub 1 is formed with a chamber or cylinder 11 into which the wash pipe 8 extends. As the mandrel 6 moves vertically during lthe operation of the tool, the wash pipe 8 will reciprocate within the chamber 11. At the upper end of the tool the mandrel 6 will slide in the anvil 4 as it reciprocates during the operation of the tool. A plurality of friction rings or shoulders 12 2,891,772 Patented June 23, 1959 ICC are formed on the mandrel 6, preferably just above the wash pipe 8. A slip or sleeve 13 is mounted in the bowl 3 and surrounds the friction rings 12 engaging these rings and preventing longitudinal movement of the mandrel 6, except `when a very substantial longitudinal pull is exerted on the drill pipe 7 and the mandrel 6. The sleeve 13 will release the mandrel 6 suddenly, thus permitting the mandrel to move upwardly, at which time the top shoulder 14 will strike the bottom of the anvil 4, thus imparting a blow or jar to the bowl 3, the bottom sub 1, and consequently, to any bit, pipe, or other object attached to the bottom sub.

Since the mandrel 6 has a considerable longitudinal movement within the bowl 3, and there being a number of accurately machined surfaces on this mandrel, it is desirable to prevent abrasive material from entering the tool and being deposited on these machined surfaces. To accomplish this l provide a plurality of annular packings 15 within the anvil 4 and which bear against the mandrel 6, and thus prevent fluid or abrasive materials from entering the top of the bowl or housing 3. Consequently, the top of the tool is packed olf and sand, water and the like will not enter the top of the tool during reciprocation of the mandrel 6. The mandrel 6 and the wash pipe 3 are hollow so as to permit circulation of uid downwardly through the tool and, consequently, the lower end of the mandrel 6 or wash pipe 8 must be packed off so as to prevent sand or other abrasive materials from passing upwardly around the bottom of the mandrel. To accomplish this, I provide a floating ring or seal 16 which tits accurately within the chamber 11 and also fits accurately around the wash pipe 8. This floating ring or seal, if made of metal, is also provided with packing rings 1'7 which engage the wall of the chain ber 11, while other rings engage the outer surface of the wash pipe 8. The seal 16 reciprocates within the chamber 11 as the mandrel 6 is reciprocated during operation of the tool. A retainer ring or abutment 16 is provided on the bottom sub 1 and projects inwardly into the chamber 11 to serve as a stop for the seal 16 and prevent the seal from being pushed out of the top of the chamber 11. An annular nut 18 on the bottom of the wash pipe 8 prevents the seal 16 from slipping oli of :the bottom of this wash pipe. The seal 16 thus effectively follows the wash pipe in its reciprocation and also acts to pack-off the bottom of the mandrel 6 and prevent any sand or other sharp material from passing upwardly past the wash pipe 8, and thus depositing on the machined surfaces of the mandrel. The method of mounting the friction sleeve 13 and adjusting the same is disclosed in Patent No. 2,059,540 and these details form no part of this invention. The floating ring or seal 16 also serves the purpose of equalizing uid pressure on the outside of the tool, that is, within the bore of the well and in the pipe 7. Therefore, the packing does not have to withstand hydrostatic pressure and as a result `will more electively seal. Before the jar is run into the well one of the plugs 16a is removed. The tool is then positioned vertically, resting on the sub 1 and the jar will, therefore, be in collapsed position. The Sub 1 and the housing 3 are now almost entirely lilled with a light oil. This column of oil in the tool will prevent the seal 16 from rising too far on the mandrel 8, that is, the mandrel 8 can move with relation to the seal 16, and that seal will not be pushed upwardly by hydrostatic pressure to a point where the seal would be damaged.

Having described my invention, I claim:

1. A jar for use in rotary drilling, comprising a mandrel, a bowl extending over the mandrel, coupling means on the bowl to which the tool to be jarred is connected, coupling means on the mandrel to which the drill pipe is connected, said mandrel being telescopically mounted within the bowl and having a longitudinal movement therein from a contracted position to an extended posi- 3 tion, striking abutments formed on the bowl and mandrel, interengageable when said bowl and mandrel are in extended position, a shoulder on the mandrel, a sleeve carried by the bowl and having means thereon for releasably engaging said shoulder to hold said mandrel in contracted position but releasable by exertion of a predetermined longitudinal strain between the bowl and the mandrel, packing means on the bowl adjacent the upper end thereof engaging the mandrel, a wash pipe depending from the mandrel, a second packing means within the bowl and slidable longitudinally on said wash pipe, said wash pipe being substantially uniform in outside diameter from top to bottom thereof to allow the second packing means to slide thereon.

2. A jar for use in rotary drilling, comprising a mandrel, a bowl extending over the mandrel, coupling means on the bowl to which the tool to be jarred is connected, coupling means on the mandrel to which the drill pipe is connected, said mandrel being telescopically mounted within the bowl and having a longitudinal movement therein from a contracted position to an extended position, striking abutments formed on the bowl and mandrel, interengageable when said bowl and mandrel arc in extended position, a shoulder on the mandrel, a sleeve carried by the bowl and having means thereon for releasably engaging said shoulder to hold said mandrel in contracted position but releasable by exertion of a predetermined longitudinal strain between the bowl and the mandrel, said bowl having a chamber therein, a wash pipe depending from the mandrel and extending into said chamber, packing means adjacent the upper end of the bowl engaging the mandrel, and a second packing means within said chamber and engaging the wash pipe, said second packing means including a ring mounted on the wash pipe and sealingly engaging the walls of said charnber, said second packing means being longitudinally slidable both in said chamber and on the wash pipe, said wash pipe being substantially uniform in outside diameter from top to bottom thereof to allow said second packing means to slide thereon.

3. A jar for use in rotary drilling, comprising a mandrel, a bowl extending over the mandrel, coupling means on the bowl to which the tool to be jarred is connected, coupling means on the mandrel to which the drill pipe connected, said mandrel being telescopically mounted within the bowl and having a longitudinal movement therein from a contracted position to an extended position, striking abutments formed on the bowl and mandrel, interengageable when said bowl and mandrel are in extended position, a shoulder on the mandrel, a sleeve carried by the bowl and having means thereon for releasably engaging said shoulder to hold said mandrel in contracted position but releasable by exertion of a predetermined longitudinal strain between the bowl and the mandrel, said bowl having a chamber therein, a wash pipe depending from the mandrel and extending into said chamber, a packing ring mounted within the chamber and surrounding the wash pipe, said packing ring sealing against both the wash pipe and the wall of the chamber, said packing ring being slidable longitudinally both in said chamber and on the wash pipe, said Wash pipe being substantially uniform in outside diameter from top to bottom thereof to allow said packing ring to slide thereon.

4. A jar for use in rotary drilling, comprising a mandrel, a bowl extending over the mandrel, coupling means on the bowl to which the tool to be jarred is connected, coupling means on the mandrel to which the drill pipe is connected, said mandrel being telescopically mounted within the bowl and having a longitudinal movement therein from a contracted position to an extended position, packing means within the bowl, said packing means engaging the mandrel, striking abutments formed on the bowl and mandrel, interengageable when said bowl and mandrel are in extended position, a shoulder on the mandrel, a sleeve carried by the bowl and having means thereon for releasably engaging said shoulder to hold said mandrel in contracted position but releasable by exertion of a predetermined longitudinal strain between the bowl and the mandrel, said bowl having a chamber therein, a wash pipe depending from the mandrel and extending into said chamber, a packing ring mounted within the chamber and surrounding the wash pipe, said packing ring sealing against both the wash pipe and the wall of the chamber` and said packing ring being longitudinally slidable both in said chamber and on said wash pipe, said wash pipe being substantially uniform in outside diameter from top to bottom thereof to allow said packing ring to slide thereon.

References Cited in the le of this patent UNITED STATES PATENTS 1,798,337 Newsom Mar. 31, 1931 1,977,110 Burns et al Oct. 16, 1934 2,059,540 Stephan Nov. 3, 1936 2,626,731 Reynolds Jan. 27, 1953 2,645,459 Sutliff July 14, 1953 2,721,056 Storm Oct. 18, 1955 

